LCI e90 328i xDrive. AA + Headers, or exhaust?

LCI e90 328i xDrive. AA + Headers, or exhaust?

Hey guys,

I'm wondering which will net me the best increase in power and acceleration. Are headers a lot more useful than, say the PE, coupled with the AA tune? I know that the whole package (intake, 3 stage manifold, headers, exhaust, tune) is the best way to go, but I don't really want to spend that much out of the gate.

I'm also wondering if the drivetrain loss will make these less worthwhile than on a RWD car.

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LCI e90 328i xDrive. AA + Headers, or exhaust?